Originally Posted by
cressers
redeeming some points and wondered is it possible on HEL-LHR-MIA to change to HEL-LHR-JFK-MIA with stopover in JFK?
I am 99% sure the answer is no, but thought I would poll the experts

Its possible, you'll need to pay separately for each sector though, so I guess for what you're actually after the answer is probably a no.